[quote=gahamby]I made my crossbar with 3/4" & 1" schedule 40 aluminum pipe.
The 3/4" sleeves into the 1" just right. I used pointed Allen key set screws to secure the 3/4" inside the 1".
[url]http://www.sailrite.com/Drill-Steady-Tubing-Tool[/url]
I used a home made version of the item linked above for the drill guide.
You can find ground clamps of various sizes at your local electrical supplier.[/quote]
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